bench-object-prototype-tostring.js

class A {
  get [Symbol.toStringTag]() { return "A"; }
}

const numbers = [0, 0.5, 1, Math.pow(2,32)-1, Infinity];
const strings = ["", '0', 'abcde', "Hello World", '6'.repeat(100)];
const objects = [{}, [], new A, Object.prototype, x => x];
const values = [{}, 0, '', x => x, []];

const n = 1e6;

function Numbers() {
  let result = "";
  for (const number of numbers) {
    for (let i = 0; i < n; ++i) {
      result = Object.prototype.toString.call(number);
    }
  }
  return result;
}

function Strings() {
  let result = "";
  for (const string of strings) {
    for (let i = 0; i < n; ++i) {
      result = Object.prototype.toString.call(string);
    }
  }
  return result;
}

function Objects() {
  let result = "";
  for (const object of objects) {
    for (let i = 0; i < n; ++i) {
      result = Object.prototype.toString.call(object);
    }
  }
  return result;
}

function Values() {
  let result = "";
  for (const value of values) {
    for (let i = 0; i < n; ++i) {
      result = Object.prototype.toString.call(value);
    }
  }
  return result;
}

var TESTS = [
    Numbers,
    Strings,
    Objects,
    Values
];

// Warmup.
for (let i = 0; i < 10; ++i) {
  for (const test of TESTS) test();
}

// Actual tests.
for (const test of TESTS) {
  console.time(test.name);
  test();
  console.timeEnd(test.name);
}